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Geomodel 2019
- Conference date: September 9-13, 2019
- Location: Gelendzhik, Russia
- Published: 09 September 2019
21 - 40 of 140 results
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A New Approach to the Construction of Seismic Boundaries in the Geological Environment Aaccording to 2D Profile Seismic Data
Authors V.I. Bondarev, S.M. Krylatkov, N.A. Krylatkova and A.N. KrylevskayaSummaryMethods for obtaining seismic images of the geological environment are based on the transfer of numerical characteristics of seismic wave fields determined at a certain time interval to the points of time (x, t0) or deep (x, z) section. However, often the images of seismic boundaries in difficult built environments on time (or deep) sections of CDP-2D, obtained by traditional processing by the method of common mid point, do not objectively reflect the true position of seismic boundaries in the section. A new approach to the definition and use of local angular parameters of reflecting boundaries for the construction of more objective images of seismic boundaries according to the data of profile observations of mogt-2D is considered. It uses information about the angles of inclination of seismic boundaries, previously found on experimental data. The basis of the transfer information from a seismic trace in point of the received image of the environment is the use calculated using the angular settings of the boundaries of the coordinates of the current point of reflection. The possibilities of their subsequent use to obtain a better understanding of the studied geological environments are shown.
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Oil Saturation Determination in Horizontal Wells – Capabilities of Two Independent Approaches
Authors D.V. Shtepin, L.N. Urmantseva and A.V. MityaginSummaryComplex approach to oil saturation determination at the offshore oilfield named after Yuri Korchagin located in the north of Caspian Sea is considered in this paper. The field is operated by Lukoil-Nizhnevolzhskneft and actively developed from 2010. Advanced LWD technologies allow to obtain both conventional log data and data that can be used for resistivity independent water saturation estimation. This kind of data becomes valuable in case of shaly reservoir rocks and in case of ambiguous interpretation of free water presence in oil-saturated zones. Besides the standard approach with Dakhnov-Archie equation, 2 independent methods were applied: using formation sigma parameter and nuclear magnetic resonance data. Sigma allows estimate water saturation independently of resistivity values. This parameter was used in reservoir rocks above the oil-water contact and that are characterized by low resistivity values and as a result low oil saturation. NMR data were used to prove two independent calculations. In case of reservoir rocks with high shale content when sigma in shales is comparable to sigma in water NMR T2 distribution data helped to distinguish free water and capillary bound water.
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Determination of Small Hydrocarbon Deposits using Prony Decomposition
Authors S.N. Smolin and G.M. MitrofanovSummaryThe search for small hydrocarbon deposits is the a difficult task for seismic exploration. For such reservoirs often there is no connection with the structural factor and they are weak manifested in the dynamic characteristics of the wave field. As a result, many small hydrocarbon deposits can be missed. The developed technology based on the Prony decomposition is a tool for studying the dynamics features of reflected waves at different frequencies. Take into acount that high-frequency oscillations react most acutely to the presence of collectors and the type of fluid, it is possible to identify them. The report provides several examples of relevant analysis. In particular, the reaction of seismic sygnals on the water deposit is demonstrated. It manifests itself at a frequency of 39 Hz, and with increasing frequency, such a reaction decreases to complete disappearance. At the same time, in the presence of oil or gas, there is an increase in the response of reflected signals at frequencies of 47 or 75 Hz, respectively, and its preservation at higher frequencies. The nature of the response of the reflected wave amplitudes is illustrated on figures and tested drilling.
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The Main Directions and Results of the Federal Program of Geological Exploration on the Taimyr Peninsula and Gydane in the XXI Century
Authors N.Z. Munasypov and V.A. BaldinSummaryCurrently, the key task of the country’s oil and gas complex is the creation of new major hydrocarbon production and processing centers. Gydan, the Taimyr Peninsula and the shelf of Russian Arctic in the Russian Federation define the main directions of exploration in the XXI century. The main prospects for further development of the Russian oil and gas production complex are connected with these territories.
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Amazonas – Stochastic Method of Modeling Geological Systems with Arbitrary Distribution of Properties, Including Statistically Unsteady Ones, Based on Non-Parametric Statistics
More LessSummaryThe paper considers the method Amazonas developed by the author, which is based on the use of non-parametric (rank) statistics in a sliding window of a given form. The use of nonparametric (rank) statistics, which makes it possible to model the spatial distributions of both discrete and continuous properties with arbitrary distributions of values, including multimodal, reproduce sharp transitions of properties without the need to build a facies model, provides resistance to clustering, incompleteness and the presence of individual error values in the source data. The ability to set an offset allows to reproduce both smooth and sharp transitions between the values, with a varying degree of variability to extrapolate the possible behavior of the system outside the studied area. The applied mathematical formalism makes it possible to obtain a realistic stochastic model of the simulated environment, directly determined by the initial data, taking into account the heterogeneity existing in it, which can be associated with lithology and other factors, without the need for preliminary expert identification of these laws. The method is suitable for modeling both stationary and non-stationary distributed spatial variables, and allows to take into account the instrumental error and the natural variation of the simulated parameters.
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Solving of Automation Aims of Kinematic Data Interpretation with Using New Approaches Illustrated in West-Siberian and the North Sea Shelf Fields
Authors P.A. Avdeev, I.I. Efremov, A.K. Bazanov and R.F. MiftakhovSummaryFaults and horizons correlation is a crucial stage in the cycle of seismic interpretation because it determines the structural framework of the field. Also, it is used as a basis for the subsequent dynamic analysis of the wave field. At the same time, the process of tracking horizons and faults continues to be one of the most labor-intensive stages, requiring a significant amount of time and human resources. Today, the geophysical service has a wide range of technological solutions aimed at automating the process of tracing reflections and fault surfaces. However, each of the proposed technologies has a series of limitations caused by the impossibility of fully automating procedures when working in the complex geological environment, as well as with low-quality seismic material. Thus, oil/gas and service companies invest a lot of effort in the optimization of structural interpretation because it is of paramount importance for the production cycle. The paper presents a new viewpoint to tackle the problem of automated interpretation under mentioned complications.
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Achimov Static Models Uncertainty Analisys Methodology and Practice within Urengoy Field
Authors V.O. Monakhova, N.Y. Natchuk and S.I. PakhomovSummaryAchimov deposits of Urengoy field contains the main gas reserves within considered license block, however they are characterized by a complex geological structure. That’s why it’s especially important purpose to estimate possible uncertainties and risks in the reserves and the forecasted profiles of hydrocarbon production. Uncertainty analysis allows to create of the set of geological model’s realization, considering main risks and allowing to estimate the range of uncertainty and probability of the hydrocarbon reserves by reference to the features of Achimov deposits geological structure. Sequence of work on the uncertainty analysis of geological model includes: creating of the base geological model (form workflow); definition of the base parameters, which bring in uncertainty in the model, and range of their uncertainty; uncertainty analysis of the hydrocarbon reserves to changes in parameters; choosing of the most influential parameters; multiversion calculation. In the result of work range of changes in Achimov deposits gas reserves and range of changes in the main volumetric parameters were justified, besides 300 realizations of geological model were calculated, which can be used as a base for hydrodynamic calculations, for planning of drilling location of projected wells and for making of further research program of reservoir.
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Creating a Conceptual Model of the YuV2 Reservoir of the Bakhilovsky LU in Order to Identify New Promising Objects
Authors I.V. Geyst and T.P. KurashSummaryThe paper describes an algorithm for building a conceptual model which includes a paleotectonic analysis to restore depositional environments, section breakdown using a sequence-stratigraphic approach, an analysis of reservoir electrofacies characteristics, a reconstruction of a depositional model, and an analysis of seismic attributes at the qualitative and quantitative levels. The resulting data was used to build a conceptual model of JV2 reservoir of Bakhilovskoye Field, identify drilling-promising areas, and make a variable resource estimate.
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Auto-Building Prior Geo-Models Using Well Log Clustering Tools on the Example of the BS Productive Formation
Authors I.M. Shiryaev, R.F. Miftakhov and A.K. BazanovSummaryFacial zoning based on field data along with the classification of well logs sections is one of the critical stages in the creation of a fundamental geological model. In this case, the classification of well sections is most often carried out manually, which implies a considerable investment of time resources and subjective results. Various automation methods are used to accelerate the process of facies modeling and obtain more objective results.
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The Features of Lithofacies Architecture of Turonian Deposits in West Siberia (The Case Study of Kharampurskoe Field)
More LessSummaryThe report deals with the analysis of Turonian lithofacies structure using the case study of one of the fields of West Siberia. In West Siberia, the Turonian is a prospective target owing to its gas content. At the same time, this type of sediments falls under hard-to-recover reserves. The major challenge in the study and development of such accumulations are their low reservoir properties due to high clay content and near-surface conditions. Lithofacies analysis was based on core studies (of 5 wells). In general, the reservoir is composed of siltstones with various content of clay and sand fractions, intensively bioturbated, with frequently occurring marine fossils. Rock typing was based on core laboratory investigations. The main criteria for classifying the rocks into lithotypes which affect petrophysical properties are the grain size distribution (sand material admixture) and clay cement content. A cyclic sequence has been recognized that consists of four cycles. Each cycle is characterized by regressive nature. It has been found that the cycles in the northern and southern parts of the field have different thickness, which is attributed to several sedimentary material source areas.
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Increasing the Reliability of Structural Map-Making in the Areas with Local Velocity Inhomogeneities Resulting from the Neotectonic Processes
Authors T.A. Nesterova, E.S. Matrosova and A.A. MikhailovSummaryLateral variations of the elastic velocities within sedimentary cover in West Siberia are considered to be smooth and slight except in case of the near surface section. Though the experience of the work in some areas of the southern part of West Siberia shows considerable local lateral velocity inhomogeneities in the middle part of section confirmed by the drilling and VSP (vertical seismic profiling) data. These inhomogeneities cannot be recognized when analyzing two-way traveltime to the reflecting boundaries and differences between them obtained from the seismic data. When the area of research is underexplored by drilling that is typical for the search stage, structural imaging is generally based on the seismic information. When using standard techniques of calculation of structural maps it’s impossible to take into account these local lateral velocity inhomogeneities, resulting in discrepancy in 25–30 m between the actual and projected depth of target horizons at further drilling. A simple technique for increasing the reliability of structural map-making is suggested for its further testing.
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Geomechanical Modeling Pre-Upper Thrust Belts of Southern Urals
Authors L.I. Minligalieva, V.Y. Kerimov, V.A. Kosyanov and R.N. MustaevSummaryThe article is devoted to the study of a large structural element of the Western Urals - the reverse-thrust belts of the Pre-Ural marginal deflection. The entire Ural cover-fold region represents a giant allochton on the outskirts of the East European Platform. The study of the geological structure of the Urals and the East European Platform showed that the real picture of dislocations includes faults as a mandatory element. The horizontal forces of compression, directed from the Urals, determined the formation of the thrusts and supports and genetically associated anticlinal structures. All plicative forms are subject to thrusts and reflect the subsequent collapse of layered strata occurring under the conditions of lateral compression. In many wells drilled in the Urals, in the sub-thrust sediments, intense oil and gas shows are noted, indicating a possible accumulation of oil and gas deposits here. The result of intensive deep exploration carried out in the trough was the discovery of a large number of hydrocarbon fields. In the course of the work, paleotectonic reconstructions based on geomechanical modeling, numerical spatial-temporal basin modeling were used, which allowed to reveal the structural evolution of the reverse-thrust belts, time and conditions for the formation of traps.
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Typification of the Prisakhalin Shelf faults based on simulation results
Authors V.Y. Kerimov, A.V. Bondarev, R.N. Mustaev and L.I. MinligalievaSummaryAccording to the results of the tectonic analysis, a map of faults and three-dimensional disturbances for a regional scale was compiled, and genetic typification of faults and their systems was carried out and their ages were determined. As a result of the tectonic analysis, we were able to carry out a generalization of the initial information about the faults, which led to a significant reduction in their number. According to the results of the analysis, 3-D models of development of faults were created for individual license areas.
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Comparative Analysis of East Arctic Basins Evolution
Authors E.A. Lavrenova, V.Y. Kerimov, A.G. Burguto, A.A. Gorbunov and R.N. MustaevSummaryEast Arctic offshore is expected to contain a significant amount of hydrocarbons. Up until now, it is a frontier area with sparse seismic data and lack of exploration wells. So, it is the case to put on analogy to estimate its petroleum potential. Northern Alaska nearest well-studied prolific petroleum province is supposed to be the main counterpart. Comparative analysis of East Arctic sedimentary basins development, including Laptev, East-Siberian, Chukchi shelves as well as North Slope performed under the investigations, which prime objective, is to understand their similarities and differences. Results revealed a high probability of petroleum systems existence in the sediment cover of East Arctic basins. However, despite all expectations, there are no analogs among them. Burial history and thickness of overburden rocks are the key factors of petroleum system maturity and potential.
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Scalable Basin Modeling – an Application for Petroleum Exploration
Authors E.A. Lavrenova, V.Y. Kerimov, A.A. Gorbunov and R.N. MustaevSummaryBasin Modeling is a powerful tool for oil and gas exploration. But it is always a non-trivial task to prepare model geometry since seismic interpretation is still an intensive and time-consuming process based on manual picking or auto-tracking of a single horizon. Only the main geologic boundaries one can obtain this way and solve merely regional tasks. Scalable Basin Modeling (SBM) technology overcomes this problem by using Stratigraphic Cube (SC) calculated automatically from seismic. SBM involves the complete set of seismic data and provides a convincing approach to construct sufficient input geometry for modeling. The technology supplies compatible nested models of the Basin, Petroleum System, and Play, based on the single detailed grid of SC. Browse basin case study demonstrates the high effectiveness of SBM under a complicated geologic condition with rapidly shifting depositional systems.
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Accounting of the Facial Layer U1 in the Permeability Forecast on the One of Fields of Western Siberia
Authors A.A. Shtyrliaeva and I.I. ZayrullinSummaryThe report shows the dependence of petrophysical parameters on the conditions of sedimentation of the reservoir. The study is based on a comprehensive analysis of core data, seismic and well logging. The absence of contradictions between these data allowed us to confidently determine the conditions of sedimentation of the reservoir. Petrophysical dependencies confirmed isolated facies. Facial logging is used to calculate permeability in wells with different facies.
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Geological and Geophysical Model of the Pre-Jurassic Base of the Central Part of the West Siberian Platform
Authors S.F. Kulagina, A.V. Tugareva, E.V. Belova and G.A. ChernovaSummaryThe study of the geological structure of the deep layers of the West Siberian Platform is important for replenishing the resource base of hydrocarbons. The report is devoted to the construction of a two-dimensional geological and geophysical model of the pre-Mesozoic mega complex based on the integration of drilling data, potential fields and regional seismic profiling.
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Two-Dimensional Inversion of Russian Electric Logging Signals Measured at Intervals of Complex Sediments
Authors A.M. Petrov, O.V. Nechaev and K.V. SukhorukovaSummaryTwo-dimensional numerical inversion is widely used by leading foreign oilfield services companies to process electrical measurements from intervals of deposits with complex structure. However, the design features of the instruments greatly complicate the use of this approach for processing measurements of Russian electric logging methods. For this reason, now two-dimensional inversion of Russian electric logging measurements is limited to processing small data intervals in scientific researches. We have developed software and technique for a two-dimensional data inversion of high-frequency induction logging sounding (VIKIZ) and Russian lateral logging (BKZ), measured in intervals of thin anisotropic layers interbedding. With use of high-precision numerical two-dimensional simulation, it becomes possible to more accurately estimate the electrophysical parameters of the environment compared with the traditional one-dimensional approach. Software and technique have been tested on a large volume of realistic isotropic and anisotropic models of terrigenous sediments with a complex invasion profile and on the practical data of BKZ and VIKIZ, measured at intervals of Western Siberia terrigenous sediments. The results of testing confirm the applicability of new software for building geoelectric models of complex sediments with evaluation of their vertical resistivity and dielectric permittivity.
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Accounting for the Influence of Inhomogeneities of the Upper Part of the Section by a Complex of Geophysical Methods
Authors I. Mityunina and S. BychkovSummaryTechnology of construction of geologic-geophysical model by complex interpretation of CDP data, high-precision gravity measurements and vertical electrical sounding is suggested. Technology is realized on a base of ArcGIS. Model created makes it possible to correct promptly near-surface effects on processing and interpretation of geophysical data.
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Using the Results of Geomechanical Modeling for the Analysis of Seismic Responses from Fractured Objects
Authors A.V. Ekimenko, D.C. Gallyamova and V.I. GolubevSummaryThe paper deals with the issue of the degree of influence of fracturing of rocks on the wave field recorded in the process of seismic exploration of oil and gas fields. The authors analyze which features of the wave field can be used to study the internal structure of the reservoir.
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